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UPDATE [table] SET [column]=0 WHERE [column] IS NULL; Null Values can be replaced in SQL by using UPDATE, SET, and WHERE to search a column in a table for nulls and replace them. In the example above it replaces them with 0.
In this article, we will look into how you can set the column value to Null in SQL. update students set Gender = NULL where Gender='F'; SELECT * FROM students ; Output: Column value can also be set to NULL without specifying the 'where' condition.
There are two ways to replace NULL with blank values in SQL Server, function ISNULL(), and COALESCE(). Both functions replace the value you provide when the argument is NULL like ISNULL(column, '') will return empty String if the column value is NULL.
Click in the column value you want to set to (null) . Select the value and delete it. Hit the commit button (green check-mark button). It should now be null.
No special syntax:
CREATE TABLE your_table (some_id int, your_column varchar(100));
INSERT INTO your_table VALUES (1, 'Hello');
UPDATE your_table
SET your_column = NULL
WHERE some_id = 1;
SELECT * FROM your_table WHERE your_column IS NULL;
+---------+-------------+
| some_id | your_column |
+---------+-------------+
| 1 | NULL |
+---------+-------------+
1 row in set (0.00 sec)
NULL is a special value in SQL. So to null a property, do this:
UPDATE table SET column = NULL;
Use IS instead of =
This will solve your problem
example syntax:
UPDATE studentdetails
SET contactnumber = 9098979690
WHERE contactnumber IS NULL;
In the above answers, many ways and repetitions have been suggested for the same. I kept looking for an answer as mentioned is the question but couldn't find here.
Another way to put the above question "update a column with a null value" could be "UPDATE ALL THE ROWS IN THE COLUMN TO NULL"
In such a situation following works
update table_name
set field_name = NULL
where field_name is not NULL;
is as well is not works in mysql
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